Solution is available. Will be posted after. Please don't just give the two numbers. Show how you arrived at your answer. This problem is an excerpt from a book titled, A Course in Triangular Numbers by Paul Chika Emekwulu. Thank you.
sort by best latest
Well, the n-th triangular number is the sum of the first n numbers. So obviously 2 such numbers are:
1+2+3+...+14 = 105
1+2+3+...+14+15 = 120
You can help the HubPages community highlight top quality content by ranking this answer up or down.
Thought I had the right answer till I saw your proof!
Copyright © 2016 HubPages Inc. and respective owners.
Other product and company names shown may be trademarks of their respective owners.
HubPages® is a registered Service Mark of HubPages, Inc.
HubPages and Hubbers (authors) may earn revenue on this page based on affiliate relationships and advertisements with partners including Amazon, Google, and others.